Welcome to HVAC-Talk.com, a non-DIY site and the ultimate Source for HVAC Information & Knowledge Sharing for the industry professional! Here you can join over 150,000 HVAC Professionals & enthusiasts from around the world discussing all things related to HVAC/R. You are currently viewing as a NON-REGISTERED guest which gives you limited access to view discussions

To gain full access to our forums you must register; for a free account. As a registered Guest you will be able to:

Participate in over 40 different forums and search/browse from nearly 3 million posts.

So, in the manual the gas valve is rated for 3-8vdc to open. (maxitrol). At the valve i am getting 34vdc, and the valve will not open! verified with manometer.
The feed for this valve is straight off the main board. And yes, i am getting 34Vdc at the board as well.

So is the board bad? or will adjusting one of the pots solve this issue? I have not heard back from tech support yet.

I am not familiar with this unit but it seems strange that the manual says 3-8vdc to open valve and you are reading 34vdc at the valve. My question is why are you getting 34vdc anywhere? It may have burned up the coil in the gas valve.

Last edited by welling service; 11-20-2012 at 12:08 AM.
Reason: add a thought